diff --git a/src/routes/events/[event_id]/(badges)/badges/[badge_id]/ae_comp__badge_print_controls.svelte b/src/routes/events/[event_id]/(badges)/badges/[badge_id]/ae_comp__badge_print_controls.svelte
index 71137af8..c18c0a9b 100644
--- a/src/routes/events/[event_id]/(badges)/badges/[badge_id]/ae_comp__badge_print_controls.svelte
+++ b/src/routes/events/[event_id]/(badges)/badges/[badge_id]/ae_comp__badge_print_controls.svelte
@@ -215,7 +215,9 @@ async function handle_print_badge() {
     if (!$lq__event_badge_obj?.event_badge_id) return;
     print_status = 'loading';
 
-    const now = new Date().toISOString();
+    // MariaDB datetime columns do not accept ISO 8601 with milliseconds or 'Z' suffix.
+    // Slice to 'YYYY-MM-DDTHH:MM:SS' — the format the DB expects.
+    const now = new Date().toISOString().slice(0, 19);
     const is_first_print = print_count === 0;
     const data_to_update: key_val = {
         print_count: print_count + 1,